90 - Thorium (Th)  information about the ground-state, ionization energy, and atomic weight data
Atomic Weight: 232.037 7(4)
Ionization Energy: 6.30670  eV
Ground-state Level:  3F2 
Ground-state Configuration: [Rn]6d27s2 

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Atomic Spectroscopic Data information on Atomic Spectroscopic Data
 Atomic Spectra Database-Lines Ground States and Ionization Energies Handbook of Basic Atomic Spectroscopic Data X-Ray Transition Energies Database Spectrum of Th-Ar Hollow Cathode Lamps
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 Atomic Transition Probability Bibliographic Database Atomic Spectral Line Broadening Bibliographic Database Atomic Energy Levels and Spectra Bibliographic Database
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 Atom Ref Data for Electronic Structure Calcs

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